Just reading this old thread and wanted to post something about the alternator pulley argument. I think the alternator pulley will help. It wont help much, but it will help because while the alternator is constantly charging the battery it is doing so at a slower rate. It is kind of the same as geting the smaller water pump pulley. There will still be water (current) delivered, but not as much as with a regular sized pulley. That is why reddog said that the alt pulley is not recommended for big sound systems.
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